Honing tool



1944- M. N. PRANGE HONING' TOOL Filed June 9, v 1941 I NVEN TOR.

ATTORNEYS IO M MAURICE PRANGE 46% WvW R VV 2 mv PF QT will] 1 1 sm Patented Feb. 1, 1944 UNITED STATESFPATEENT OFFICE HONING TOOL Maurice Prange, Detroit, Mich.

Application June 9, 1941, Serial'No. 397,314

6 Claims.

This invention relates generally to honing or lapping tools and refers more particularly to honing tools of the type having provision for adjusting the stones or abrasive elements radially to provide for honing bores of different diameter.

One of the principal objects of this invention is to provide a relatively simple, inexpensive honing tool having stone retaining members respectively mounted on a cage for movement radially of the cage and normally urged in an outward direction relative to the cage by suitable springs. With the above construction, the springs yieldably urge the abrasive elements, or stones, outwardly into engagement with the wall of a bore to be honed and the pressure exerted by the stones on the wall of the bore may be varied to suit the particular metal or material honed by selecting springs of different strength.

Another object of this invention is to provide a tool of the general type set forth above wherein the stone retaining members are respectively mounted in outwardly opening channel-shaped holders for sliding movement relative to the holders radially of the cage and normally urged outwardly relative to the holders by suitable springs positioned between the base portions of the channel-shaped holders and the radially inner sides of the retaining members.

Still another advantageous feature of this invention is to provide cooperating engaging means on the holders and retaining members for definitely limiting the extent of outward movement of the retaining members relative to the holders by the springs.

A further feature of this invention is to provide the honing tool with means for radially adjusting the stone holders relative to the cage so as to enable the maximum diameter of the hone to be varied.

A still further object of this invention is to provide means for locking the stone retaining members against movement relative to their respective holders and thereby provide alrigid hone capable of being adjusted by the means set forth in the preceding paragraph.

Still another object of this invention is to provide a honing tool wherein the ends of the stone retaining members at one end of the tool may be locked against radial movement relative to their respective stone holders and wherein the opposite ends of the retaining members may be free to move outwardly relative to the stone holders under the action of the springs. As a result, the stone retaining members may have a swinging this is desirable in honing tapered or contoured bores.

In addition to the foregoing, this invention contemplates the provision of channel-shaped sheet metal backing members or clips for the stone having spaced ribs or raised portions forming a positive seat for the stones and forming a space for receiving cement or other suitable material for securing the stones in the clips.

The foregoing, as well as other objects, will be made more apparent as this description proceeds, especially when considered in connection with the accompanying drawing, wherein:

Figure 1 is a longitudinal sectional view through a honing or lapping tool constructed in accordance with this invention;

Figure 2 is a cross sectional view taken substantially on the plane indicated by the line 22 of Figure 1;

Figure 3 is an enlarged fragmentary longitudinal sectional view through one of the stone holders;

Figure 4 is a cross sectional view taken on the line 4-4 of Figure 1;

Figure 5 is a cross sectional view taken on the line 5-5 of Figure 1;

Figure 6 is a cross sectional view showing a modified form of backing member or clip for the stone; and

Figure 7 is a sectional view taken on the line 1-1 of Figure 6.

In Figure 1 of the drawing, I have shown a lapping or honing tool provided with a cage I0 having heads I I and 12 at opposite ends integrally connected together by circumferentially spaced longitudinally extending ribs l3; Upon reference to Figure 2, it will be noted that stone holders it extend longitudinally of the cage I0 between the ribs I3 and are substantially channel-shaped in cross section.

The stone holders I l are spaced equal distances from each other circumferentially of the cage and are mounted on the latter with the channels opening outwardly. In the present instance, each holder I4 is provided with flanges l5 and It at opposite ends thereof adapted to respectively slidably engage in radially extending slots I1. and I8 respectively formed in the heads H and I2. The above construction is such as to permit the stone holders I l to be moved radially with respect to the cage to vary the diameter of the honing tool.

While various difierent types of mechanism may be employed to simultaneously radially admovement about their relatively fixed ends and 55 just the st ne holders l4 relative to the cage 10,

nevertheless, for the purpose of illustration, I have shown this adjustment as accomplished by a pair of scrolls I9 and 25. The scrolls I9 and 25 are respectively positioned beyond the heads II and I2 and are secured to the opposite ends of a shaft 2| journaled in bearings formed on the heads of the cage. The inner surfaces of the scrolls are provided with threads 22 adapted to respectively mesh with corresponding threads 23 formed on the flanges I and I6 at opposite ends of the stone holders. The scrolls 22 are rotated by means of a pinion 24 adapted to mesh with a gear 25 formed integral with one of the scrolls 22 and secured to a revoluble shaft 26. The shaft 26 is journaled in the driving head 21 and may be rotated by a suitable tool (not shown). above construction, it will be noted that rotation With the the extent of radial movement of the adjacent of the scrolls 22 in one direction by the pinion 24 I and shaft 2| moves the stone holders I4 radially outwardly to increase the diameter of the honing tool. On the other hand, rotation of the scrolls in the opposite direction by the pinion 24 and shaft 2i moves the stone holders I4 inwardly to reduce the diameter of the honing tool.

Mounted in each of the channel-shaped stone holders I4 for sliding movement radially of the stone holders is a longitudinally extending stone retaining member 28 having a longitudinally extending groove in the radial outer surface thereof for receiving an abrasive element or stone 29. In accordance with conventional practice, each abrasive element or stone 29 is cemented or otherwise suitably secured in a channel-shaped sheet metal backing member or clip 30. The clip 30 extends for substantially the full length of the stone and is provided with laterally outwardly extending ears 3| at opposite ends engageable in recesses formed in the adjacent ends of theretaining members 28. As a result, the clips 30 function to removably secure the abrasive members or stones 29 in assembled relation with the retaining members 28.

The retaining members 28 are yieldably urged radially outwardly relative to their respective holders I4 by means of coil springs 32 having the inner ends abutting the base portions of the channel-shaped holders I4 and having the outer ends extending into recesses 33 formed inthe radially inner sides of the retainers 28 adjacent opposite ends of the latter.

With the construction thus far described, it will be noted that when the honing tool is inserted into a bore, the springs32 act on opposite ends of the retainers 28 to urge the stones or abrasive members 29 into frictional engagement with the walls of the bore. The pressure of engagement of the abrasive members or stones 29 with the walls of the bore depends upon the strength of the springs 32 and, accordingly, this pressure may be varied to suit different conditions by selecting springs of different strength.

According to the present invention, the extent of movement of the retainers 28 outwardly relative to the holders I4 is limited by cooperating engaging means on the holders I4 and the respective retainers 28. In the specific embodiment of the invention, each retainer 23 is formed with two transversely extending threaded bores 34 and 35 through opposite ends thereof. Upon reference to Figure 4, it will be noted that a stud 36 is threaded in the bore 34 in each retainer 28 and is provided with a reduced shank 31 at one end adapted to extend into a radially extending slot 38 formed in the adjacent flange I4 of the associated stone holder I4. The opposite end of ends of the retainers 28 is limited by the length of the slots 38 and the radially outer walls 42 of the slots form definite stops which determine the outermost positions of the ends aforesaid of the retainers 23 relative to their respective holders I4. On the other hand, when the studs 36 are adjusted to the positions thereof wherein the tapered heads 39 engage the adjacent seats 40 on the stone holders, the ends of the retainers 28 provided with the studs 36 are rigidly held in their outermost positions with respect to the stone holders I4. Attention may also be called to the fact at this time that the length of the bores 34 approximates the overall length of the studs 35 so that the latter may be adjusted in the bores to a position wherein the retainers 28 merelyfloat in the holders and movement thereof is not affected by the studs 36.

A similar stud 43 is threaded in the bore 35 formed in each of the retainers 28 at the oppo site ends thereof. However, the studs 43 are reversed end for end with respect to the stud 36 and the reduced portions 44 extend into radial slots 45 formed in the flange I 4" of the holder I4.

It follows from the above that the radially outer walls 46 of the slots 45 cooperate with the corresponding outer walls 42 of the slots 38 to form stops for engagement with the reduced ends of the studs to definitely limit the radial outward movement of the retainers relative to the holders by the springs 32. 7

'Upon reference to Figure 5, it will be notedthat the studs 43 are also provided with tapered heads 4]. which are adapted to engage corre-f spondingly tapered seats 48 on the flange I4 of the stone holders I4 and thereby lock the adjacent ends of the retainers against radial movementrelative to the stone holders I4. openings. are formed in the flanges I4 on the stone holders I4 in registration with the bores 35 to permit extending a suitable tool into en: gagement with the slotted head portions of the studs 43.

With the above construction, it will be observed that when the studs 36 and 43 are in the positions thereof shown in Figures 4 and 5, the extent I of radial movement of the retainers 28 relative to the stone holders I4 is limited by the length of the slots 38 and 45. In the above positionof the parts, the maximum diameter of the hone is determined by the radially outer end walls 42 and 46 of the slots 38 and 45 respectively. In this vided on the stone holders. As a result. the

Suitable stone retainers 28 are prevented from movement relative to the stone holders l4 and any adjustment of the diameter of the hone is accomplished through the medium of the scrolls 22. In cases where it is desired to hone a tapered or contoured bore, it may be desirable to pivotally support the stone retainers on their respective stone holders M. This may be accomplished by engaging the tapered heads of the studs at one end of the honing tool in'the adjacent seats formed in the stone holders i4 and by adjusting the studs at the opposite ends of the retainers to a position wherein the reduced portions extend into the slots formed in the adjacent sides of the stone holders H1. As a result of the above adjustment,

the stone retainers will pivot about the axes of the studs engaged with the seats. For example, if the studs 36 are adjusted to engage the tapered heads 39 With the seats Won the flange IA" of the stone holders l4 and the studs 43 are adjusted so that the heads 41 are free from engagement with their respective seats 48 in the flange M of the stone holder, the latter ends of the stone retainers are free to pivot about the axes of the studs 36.

Thus, from the foregoing it will be observed that I have provided a highly flexible honing tool which may be advantageously used to hone bores of different diameter and contour. It will also be noted that the tool is of relatively simple construction and may be readily adjusted to suit existing conditions.

Referring now to the embodiment of the invention shown in Figures 6 and 7, it will be noted that I have illustrated a novel clip or backing member B for an abrasive member or stone. The clip is preferably formed from sheet metal by a stamping operation and is channel-shaped in cross section. The base 5| of the clip is provided with longitudinally extending ribs 52 which project into the channel and form a definite seat for the stone or abrasive member. The ribs 52 are spaced from each other and from the side flanges of th channel to provide a clearance 53 for a suitable cement or other material capable of securing a stone in the channel. This construction is highly advantageous in that it insures properly positioning the stone in the clip Without interference from the cement or other bonding material.

What I claim as my invention is:

1. In a tool of the class described, a revoluble cage, a plurality of holders channel shaped in cross section mounted on the cage in spaced relation to each other circumferentially of the cage and with the channels opening outwardly, a retainer mounted in the channel of each holder for sliding movement relative to the holders radially of the axis of said cage and having an abrasive element on the radially outer surface thereof, a stud threaded in a transverse bore extending through each retainer and having the opposite ends alternately engageable in a radially extending slot in the adjacent side of each holder to limit the extent of radial movement of the retainers relative to the holders and engageable with a seat in the opposite side of each holder to hold the retainers against sliding movement radially of the holders, and yieldable means supported in the channel-shaped holders between the base portions of the holders and the radially inner ides of the retainers for urging the retainers radially outwardly relative to the holders.

2. In a tool of the class described, a revoluble cage, a plurality of holders channel shaped in cross section mounted on the cage in spaced relation to each other circumferentially of the cage and with the channels opening outwardly, a retainer mounted in the channel of each holder for sliding movement relative to the holders radially of the axis of said cage and having an abrasive element on the radially outer surface thereof, a stud threaded in a transverse bore extending through each retainer and having the opposite ends alternately engageable in a radially extending slot in the adjacent side of each holder to limit the extent of radial movement of the retainers relative to the holders and engageable with a seat in the opposite side of each holder to hold the retainers against sliding movement radially of the holders, the overall length of the studs being less than the length of the bores to permit adjusting the studs to positions wholly within the bores and one side Wall of each holder being apertured opposite the associated stud to permit one end of the latter to be engaged by a tool for adjustment purposes, and yieldable means supported in the channel-shaped holders between the base portions of the holders and the radially inner sides of the retainers for urging the retainers radially outwardly relative to the holders.

3. In a tool of the class described, a revoluble cage, a plurality of holders channel shaped in cross section mounted on the cage in spaced relation to each other circumierentially of the cage with the channels opening outwardly, a retainer mounted in the channel of each holder for sliding movement relative to the holders radially of the axis of the cage and having an abrasive element on the radially outer surface thereof, means for selectively holding the retainers against sliding movement relative to their respective holders including a pair of studs respectively threaded in transverse bores formed in each retainer adjacent opposite ends of the latter and having portions operable in one adjusted position of the studs to engage recessed seats formed in the adjacent flanges of the channel shaped holders, and yieldable means normally urging the retainers in a radially outward direction relative to the holders.

4. In a tool of the class described, a revoluble cage, a plurality of holders channel shaped in cross section mounted on the cage in spaced relation to each other circumferentially of the cage with the channels opening outwardly, one of the flanges of each holder having a recessed seat adjacent one end and the other of the flanges of each holder having a recessed seat adjacent the opposite end, a retainer mounted in the channel of each holder for sliding movement relative to the latter radially of the axis of the cage and having an abrasive element on the radially outer surface thereof, a stud threaded in a transverse bore extending through each retainer at one end of the latter and having a portion operable in one adjusted position of the stud to engage the recessed seat in the first flange aforesaid, and a second stud threaded in a transverse bore extending through the opposite end of each retainer and having a portion operable in one adjusted position of the stud to engage the recessed seat in the second flange aforesaid to cooperate with the first named stud in holding the retainers against sliding movement relative to the holders.

5. In a tool of the class described, a revoluble cage, a plurality of holders channel shaped in cross section mounted on the cage in spaced relation to each other circumferentially of the cage with the channels opening outwardly, one of the flanges of each channel having a recessed seat adjacent one end and having a radially extending slot adjacent the opposite end, the other flanges of each channel having a radially extending slot opposite the recessed seat in the first flange and having a recessed seat opposite the radially extending slot in the first flange, a retainer mounted in the channel of each holder for sliding movement relative to the holders radially of the aXis of the cage and having an abrasive element on the radially outer surface thereof; a stud threaded in a transverse bore extending through each retainer at one end of the latter and having the opposite ends alternately engageable in the radially extending slot and with the recessed seat at one end of each holder, a second stud threaded in a transverse bore extending through the opposite end of each retainer and having the opposite ends thereof alternately engageable with the recessed seat and in the registering radialsl'ot at the other end of each holder, and yieldable means normallyurging the retainers in a radially outward direction relative to their respective holders.

6. In a tool of the class described, a revoluble cage, a plurality of holders channel shaped in cross section mounted on the cage for movement radially of the axis of the cage andspaced from each other circumferentially of the cage with the channels opening outwardly, a retainer supported in the channel of each holder with the opposite side walls respectively slidably engaging the flanges on the holders to enable movement of the retainers relative to the holders radially of the axis of the cage, means for holding the retainers in assembled relationship with the respective holders, an abrasive element for each retainer and a metal clip permanently secured to each abrasive element for respectively securing the latter elements to the radially outer portions of the retainer.

- MAURICE N. PRANGE. 

